package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.vo.OrderReportVO;
import com.sky.vo.SalesTop10ReportVO;
import com.sky.vo.TurnoverReportVO;
import com.sky.vo.UserReportVO;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * 数据统计业务实现
 *
 * @Author itcast
 * @Create 2023/5/6
 **/
@Service
@Slf4j
public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    /**
     * 统计指定时间区间内的营业额数据
     * @param begin
     * @param end
     * @return
     */

    @Override
    public TurnoverReportVO getTurnover(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        while (!begin.equals(end.plusDays(1))){
            dateList.add(begin);
            begin=begin.plusDays(1);
        }
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map =new HashMap();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED);
            //查询指定日期的营业额
            Double turnover=orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }
        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList,","))
                .turnoverList(StringUtils.join(turnoverList,","))
                .build();

    }
    /**
     * 统计指定时间区间内的用户数量(总用户量、新增用户量)
     * @param begin
     * @param end
     * @return
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();

        while (!begin.equals(end.plusDays(1))){
            dateList.add(begin);
            begin = begin.plusDays(1);
        }

        List<Integer> totalUserList = new ArrayList<>();
        List<Integer> newUserList = new ArrayList<>();

        for (LocalDate date : dateList) {//5-1
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);

            //SQL: select count(id) from user where create_time > begin and create_time < end ----新增用户数量
            //SQL: select count(id) from user where  create_time < end ----总用户数量
            Map map = new HashMap();
            map.put("end", endTime);
            Integer totalUser = userMapper.countByMap(map);//总用户数量

            map.put("begin", beginTime);
            Integer newUser = userMapper.countByMap(map);//新增用户数量

            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }

        return  UserReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .build();
    }
    /**
     * 统计指定时间区间内的订单数量
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();

        while (!begin.equals(end.plusDays(1))){
            dateList.add(begin);
            begin = begin.plusDays(1);
        }
        List<Integer> totalOrderList = new ArrayList<>();
        List<Integer> validOrderList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            //SQL: select count(id) from orders where order_time >= begin and order_time <= end ---某天的订单总数
            //SQL: select count(id) from orders where order_time >= begin and order_time <= end and status = 5 ---某天的有效订单总数

            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            //查询某天的订单总数
            Integer totalOrder = orderMapper.countByMap(map);

            map.put("status", Orders.COMPLETED);
            //查询某天的有效订单数
            Integer validOrder = orderMapper.countByMap(map);

            totalOrderList.add(totalOrder);
            validOrderList.add(validOrder);
        }

        //时间区间内的订单总数
        Integer totalOrderCount = totalOrderList.stream().reduce(Integer::sum).get();
        //时间区间内的有效订单总数
        Integer validOrderCount = validOrderList.stream().reduce(Integer::sum).get();


        Double orderCompletionRate = 0.0;
        if(totalOrderCount > 0){
            //订单完成率
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }

        return  OrderReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .orderCountList(StringUtils.join(totalOrderList,","))
                .validOrderCountList(StringUtils.join(validOrderList,","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }
    /**
     * 统计指定时间区间内的销量排名数据 top10
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO getTop10Statistics(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        //统计销量数据
        List<GoodsSalesDTO> list = orderMapper.getTop10(beginTime, endTime);

        List<String> nameList = list.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        List<Integer> numberList = list.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());

        return   SalesTop10ReportVO.builder()
                .nameList(StringUtils.join(nameList,","))
                .numberList(StringUtils.join(numberList,","))
                .build();
    }
}
